Floating motor pulley



April 14, 1931- w. D. COLLINS ETAL 1,800,718

FLOATING MOTOR PULLEY Filed OCL. 12, 1926 uw i Vm Caza/ @if wwwa@ y www] www?, l @4M ,JM

llatsailed Ill-l, i931 agarrar orifice WILLIAII D. COLLNS AND ELMER W'DERBORG, F EVANSVILLE, NDIANA, ASSIGNOR-S, BY MESNE ASSIGNMENTS, T SEB/VEL, INC., OF NEW YORK, N. Y., A CORPORATION OF DELAWARE Application filed October l2, 1926. Serial No. 141,137.

Our invention relates to friction drive mechanisms and has for its object the provision of an improved mechanism of this class which is simple in construction, efficient in operation and which may be economically manufactured.

More specifically it is the object of our invention to provide an improved friction driving pulley, for use on the armature shaft of a motor, which is slidable on the shaft and will thus permit the armature to move freely in seeking its field.

With the above and incidental objects in view, the invention consists in certain novel features of construction and combination of parts, the essential elements whereof are recited in the appended claims and the preferred forms of embodiment of which are described in detail hereinafter and illustrated in the accompanying drawings in which Fig. 1 is a vertical cross sectional view of the friction drive mechanism in which the driving pulley is shown as attached to the shaft of a motor;

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Fig. 2 is a half sectional view thereof talen on the line 2 2 of Fig. l;

3 is a vertical cross sectional view of a modified form of driving pulley, and

Fig. l is a cross sectional view thereof taken on the line 4 4 of Fig. 3.

ln friction V drive mechanisms wherein the one pulley comprises a disc which meshes with a circumferential `groove in the other pulley, it is, of course, necessary that the two pulleys be maintained in accurate alignment with each other to insure smooth running and even wearing of the parts. When the driving pulley is on a motor shaft, it is diilicult to maintain the pulleys in alignment because of the tendency of the armature of the motor to shift axially in seeking its electro-magnetic field. lt is, therefore, desirable to have the driving pulley 'axially slidable on the armature shaft so as to prevent unnecessary wear on the friction disc of the driving pulley, loss of power, and to eliminate vibration and noise.

ln Figs. 1 and 2 the end portion of a motor housing is shown at 5 with a projecting end of its armature shaft G. A flanged body comprising a collar 7 and a flange 11 is secured to the shaft 6 by a tapered pin 8. A disc 9 of fiber or other suitable material fits loosely over the body 7 and is axially slidable thereon. The dise 9 is constrained to rotate with the body 7 by a plurality of pins 10, which screw into the flange 11 which is integral with the body 7. The fiber disc 9 carries metallic bushings 12 which are bored to receive the pins 10. A plate 13, drilled to receive the ends of the pins 10, fits over the end of the body 7 and rests against a shoulder 14 thereon. A cap 15 having internal threads adapted to engage the complemen` tary threads formed on the end of the body 7 has a heXagon-shaped portion 16 by which it may be readily screwed upon the body to force the platel in position abutting the shoulder 14.

lt will be apparent that as the armature shaft 6 moves axially it will carry with it the body 7, but the friction disc 9, being in mesh with the groove in the driven pulley 18, will be held in alignment therewith and will slide axially on the pins 10. In this manner the armature and its shaft may freely shift axially in seeking the most desirable magnetic iield while the driving pulley floats thereon maintaining its position relative to the driven pulley. By removing the nut and the plate 13 the fiber disc 9 may be easily taken from the body for repairs or replacement.

It will be seen that parts 11 and 13 act as stop members limiting the axially extend ing bearing surface on the collar and that the width of the disc 9 is less than the length of the bearing surface.

ln Figs. 3 and l a modified construction of the driving pulley is shown. rlhe main features of its construction and operation are essentially similar to those of the above described embodiment, the differences in structure being mainly in details. The body 21 is pinned to the armature shaft 22 and has two diametrically opposite key-ways 23 cutthereinl The liber disc 2li is secured between two metallic plates 25 by a plurality of rivets 26. The plates 25 have key portions 27 which t in the key-ways or slots 23, thus lcausing the liber disc 24 to rotate with the body 21,. A flange 29 limits the axial movement'of the fiber disc 24 and plates 25'in one direction, whilea cap-nut 28 threaded over the end of the body 21 limitsftheir movement in the opposite direction. The advantages of this/construc- Y-'V tion are that the friction, disc A24 isY laterally supportedby the V'metallic plates 25, thus lo causing. it toy retain its'shape and lengthen its life. `Y Thefriction disc assembly may be easilyremoved and replaced kby unscrew-V ing the cap nut 28.i While in V.operation the Vfriction' dise will maintain its alignment with the driven' pulley, sincev it is freely axially slidable'on-the body 2l. l f y' hile we have shown and described particularembodiments ofonr invention, it is to be understood that we do not wish to limit ourselves to the constructions shown, but. de- "sire the scope of ourlinvention to be limited only by the claims which follow:

v Ve'Claim: Y i

shaft, a cylindrical collar fixed onsaid shaft having a smooth outsidesurface, a flange on Y said collar, aj plate attached to vsaid collar spaced from the Hangs and leaving a bear- 'ing surface therebetween,.-a disc'of narrower Y width than the bearing surface mounted on .the collar between the fiange andthe plate, axial pinszsecuredto-said flange and passing Y through said disc,'-the arrangement being vsuch that the "disc has axial movementbetween the plate andthe iange and rotates withthe shaft due to the 'pins and a member meshing with the disc. Y y 2. A driving` mechanism comprising a y driving shaft, a collar secured on said shaft,

a flange on'said collar at one end thereof,the other end Vof said collar being cut to form 'Y a shoulder and screw-threaded beyond theV ingV a width less than the distance between the shoulderand the Harige, aplate secured on .the collar and against the shoulder, pins i extending between the iange and Vplate and through vthe diso,"the arrangement being such that thel disc lcan slide axially between theflange and thelplate 'and rotates .with lthe shaft due tol thepins and a pulley mesh- Ving with the disc to be driven thereby. f 3. d rivingA mechanisml comprising'a shaftda collar fixed on said shaft having a smooth external surface, a liange on said Vcollar, a plate secured; to said collar spaced from the iiange'and leaving ay bearing fs'urface therebetween,a disc of narrower width than the bearing surface mounted on the collar b'etweenithe flangerand the plate, means permitting free axial 'movement of said disc Y on the collar-between the flange and the plate and causing the disctorotate with the shaft Vanda member meshing with the disc wherelar between the stop members land vcausing the disc to rotate with the shaft. A,

In witness whereof, we hereunto subscribe our names' this 24 day of Sept., 1926.

WILLIAM D. COLLNS. ELMER WilDERBORG.

'Y 1. A ldriving kmechanism comprising a shoulder, a disc surrounding the collarhav- 

